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AVL.ImageInversePolarTransform(AvlNet.Image, AvlNet.Point2D, AvlNet.PolarSpaceType, AvlNet.PolarInterpolationMethod, AvlNet.Image)

Transforms an image from polar or log-polar space to euclidean space.

Namespace:AvlNet
Assembly:AVL.NET.dll

Syntax


public static void ImageInversePolarTransform(
	AvlNet.Image inImage,
	AvlNet.Point2D inCenter,
	AvlNet.PolarSpaceType inInputSpaceType,
	AvlNet.PolarInterpolationMethod inInterpolation,
	out AvlNet.Image outImage
)

Parameters

inImage
Type: AvlNet.Image
Input image
inCenter
Type: AvlNet.Point2D
Center of the coordinate system in output image
inInputSpaceType
Type: AvlNet.PolarSpaceType
Method of transformation
inInterpolation
Type: AvlNet.PolarInterpolationMethod
Method of underlying interpolation
outImage
Type: AvlNet.Image
Output image

Description

Reverses ImagePolarTransform using the following transformation:

\[ src(x,y) = dst(\rho, \phi) \]

where

\[ \rho = m \sqrt{x^2 + y^2} , \phi = \arctan(\frac{y}{x}), \]

for linear-polar space, and

\[ \rho = k \log{\sqrt{x^2+y^2} }, \phi = \arctan(\frac{y}{x}), \]

for log-polar space, which emulates the human "foveal vision".

Parameters \(m\) and \(k\) are chosen so that entire source image could fit into output image.

Transformation does not change image dimensions.

Examples

Original image, ImagePolarTransform and ImageInversePolarTransform performed on the sample image with inCenter = (150,150) for log-polar space type.

See also